Here's the BNGHelp2 thread for Error Code: Monkey. Post your problem here for troubleshooting help from Bungie and other users.
https://www.bungie.net/en/Forum/Post/75534241/0/0
Also, here is the official Error Code Monkey page, refer to it for more information.
https://www.bungie.net/en/help/?search=MONKEY
I hope that sends you in the right direction. Best wishes, Guardian.
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Greatly appreciated.